A Synchronization Method of Acoustic Wave Asynchronous Serial Port Signal While Drilling

Abstract

The invention relates to the field of logging-while-drilling technology, and provides a method for synchronizing acoustic wave asynchronous serial port signals while drilling. The asynchronous serial port communication mode is used to realize the communication and high-voltage signal isolation between the transmitting end and the receiving main control board; the receiving control board serves as The main control terminal configures parameters for the transmitting terminal through asynchronous serial communication, and controls the excitation of the sound source; the transmitting terminal is the initiator of the synchronous sound source excitation signal; through the cooperation of the two, the signal synchronization is realized under the condition of asynchronous communication; the transmitting terminal includes several The launch board, the asynchronous serial communication between the launch board and the receiving control board is realized through 2 data lines R+ and R‑. Beneficial effects of the present invention: the strong electric high-voltage signal at the transmitting end does not affect the data acquisition and control at the receiving end; the transmitting end and the receiving end only need 2 signal lines to complete data transmission and signal synchronization, and no additional signal line is required as a synchronization signal ; The synchronization precision is high, and the maximum error is controlled within one crystal oscillator clock; the method is simple and efficient, and is suitable for popularization and application.

Description

technical field [0001] The invention relates to the technical field of logging while drilling, in particular to a method for synchronizing acoustic wave asynchronous serial port signals while drilling. Background technique [0002] The acoustic logging while drilling is different from the wireline acoustic logging tool. In the acoustic logging while drilling, due to the limitation of the transmission rate, the control and data processing are quickly completed downhole. The timing control of transmission and reception of acoustic logging while drilling is complex, and the amount of data calculation is large. In order to ensure real-time performance, it is necessary to reasonably schedule the control and data processing processes and coordinate the overall work of the instrument. [0003] The electronic system of acoustic logging while drilling is composed of acoustic wave transmitting circuit, signal receiving and processing circuit, data acquisition circuit, receiving main c...

AI Technical Summary

Problems solved by technology

[0010] Since the command is transmitted by asynchronous serial port communication, if the baud rate is 9600dps, and the other conditions remain unchanged, the time of each transmission will fluctuate within 1 / 9600s, then the time when the sound source is excited and the start of acquisition The time difference between the moments of the signal is Δt, which will also fluctuate within 1 / 9600s, resulting in a shift in the time window of each signal acquisition

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